Hi, first post on here. I just purchased a 1980 Duranautic 16 ft offshore side console, and it has foam flotation material running along the gunwales from bow to stern on both sides. It;s in rough shape and I was thinking to just get rid of it since I doubt it is functional (when you rub it, it comes off in a powdery form). Does anyone know if this stuff was USCG mandatory, or put on after-market? It is/was the same foam green color as the inside of the boat. I have no plans to use this boat in the ocean, just local lakes.